Self-acting warp-tension-regulating motion for looms for weaving



P. SCHOLES.

SELF ACTING WARP TENSION REGULATING MOTION FOR LOOMS FOR WEAVING. APPLICATION FiLED JUNE 8.1920,

1,350,943. Patented Aug. 24, 1920.

2 $HEETSSHEET P. SCHOLES. SELF ACTING WARP TENSION REGULATING MOTION FOR LOOMS FOR WEAVING. APPLICATION FILED JUNE 8.1920.

1 3 50, 94 3 Patented Aug. 24, 1920.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE.

PETER SCHOLES, 0F HYDE, ENGLAND.

Application filed June 8, 1920.

To all whom it may concern.-

Be it known that I, PETER SoHoLEs, a subjcct of King George V of Great Britain, residing at Hyde, in the county of Lancaster, England, have invented a new and useful Improvement in Self-Acting ,VVarp-Tension- Regulating Motions for Looms for Weaving, of which the following is a specification.

This invention has reference to warp let off motions and to the regulation, by the movement of a warp feeler device, of the tension of the warp in unwinding from the warp beam in looms for weaving, and comprising the provision of improved simple and eiiicient means for self-actingly regulating the tension as the diameter of the warp on the beam gradually decreases, said means also permitting the tension to be taken off the warp at will by manual operation or by any appropriate timing motion on the loom so that the loom may be reversed or the warp slackened whenever required or at predetermined periods.

I am aware that it has been previously proposed, in let-off mechanism of looms, to employ a braking device provided with a power applying member acting on a brake lever through a part movable along the surfaces of said lever and said member, the said part being moved by a roller bearing against the warp beam so that the point of application of the power is progressively moved as the diameter of the warp beam diminishes to effect a change of leverage with a diminution in the braking pressure, and no broao claim is herein made to such a type of let-off mechanism.

In order that my invention may be fully described reference is hereinafter had to the accompanying drawings in which Figure 1 is a'rear elevation of a portion of a warp beam showing the application of my improvements, the parts being shown in the positions they occupy when the beam has a full complement of Warp thereon;

Fig. 2 is a similar view to Fig. 1 but showing the parts in the positions they occupy when the beam is substantially exhausted of warp;

Fig. 3 is also a similar view to Fig. 1 showing the parts when fully released to allow for the reversal of the loom;

Fig. 4 shows a modification of the apparatus for use in weaving certain goods in Specification of Letters Patent.

Patented Aug. 24, 1920.

Serial No. 387,501.

which a periodical release of the tension of the warp beam is called for;

Fig. 5 is an enlarged detail of the weighted tumbling catch lever showing a modification: I

Fig. 6 is a cross section taken on line :0, of Fig. 1, and

Fig. 7 illustrates a modification hereinafter referred to.

Referring to the drawings, a represents an ordinary follower or feeler which engages the warp b wound on the warp beam 6 and is constrained to remain in yielding engagement therewith as the diameter of the warp decreases by the action of a weight or spring somewhat as ordinarily.

According to my invention the follower or feeler a is carried by a suitable lever c pivotally mounted at 0' on a stud secured to a fixed bracket or plate (Z. The extremity of the said lever has a lug or thickened part c thereon the upper end of which is inclined to form an engaging or locking surface with which is adapted to be engaged a catch 6 on a weighted tumbling lever pivotally mounted on a stud at the end of a lever f pivotally connected at f to the lever 0. '(Jonnected to a pin 9 on the lever f is one end of a link or rod it which extends in a horizontal direction toward the outer end of the warp beam and carries at its extremity a friction bowl or pulley 2'. The said friction bowl or pulley is supported between two movable surfaces pivotally mounted on the bracket or plate d, the upper one of which comprises an ordinary balanced or weighted lever j and the lower one a pivoted arm 70 having an upwardly curving outer end is. The arm 7: has attached thereto near its pivot stud a link Z to which is connected one end of a chain or cord m or like flexible connection which is coiled in known manner around the ruffle n on the warp beam and its opposite end secured to a fixed stud or link 0, or, in modification, as shown in Fig. 7, to an arm 1 on a shaft or rod 2 parallel with the warp beam Z) and having a cord or chain m 01 passed around a ruffle at the opposite end of the warp beam secured to a second arm 3 thereon and extending outward to the opp0- site hand, so that the variation of the tension on the chain or cord m will be transmitted by the rocking of the transverse shaft to the chain or cord at the opposite end of the warp beam. This arrangement will be found very advantageous in the caseof wide looms or of loom'sfweaving very heavy cloth. When the warp beam has its full diameter of warp, as shown in Fig. l the parts are in the position shown in said figure the lever being locked to the lever c by the weighted catch lever e and the friction pulley or bowl 7; being held near the left hand end of the arm it and the pivot center of the lever j. 011 the lever c is pivotally mounted a pawl p which is adapted by gravity to engage with successive ratchetteeth'on the plate d as the lever 0 rises with the diminishing diameter of warp on the beam 6 and prevent return movement thereof. The counter-balance weight j on the outer end of lever j and the chain coiled around the warp beam or ruiile, maintain the said parts in frictional engagement with the bowl 2', and as the feeler follows the diminishing diameter of the warp on the beam, the lever 0 moves from a substantially horizontal position (Fig. 1) and by the time the warp is practically exhausted, arrives at approximately a vertical position (Fig. 2) during which movement of the leversthe friction bowl 11 has advanced outwardly to a position such as indicated in Fig. 2.

Inthe movement of the pulley 2' outwardly from the position shown at Fig. l to that shown at Fig. 2, the tension on the chain or flexible connection at has been gradually reduced relatively to the amount of warp unwound f iOni the beam and the position of' the bowl i between the levers jand i In order that thepulley i may have an easy and certain motion, I provide two pulleys or rollers 1 r of enlarged diameter 7 which are mounted on the same stud as the pulley i one on each side thereof, and pro vide ways on the arm 10 on which said rollers are adapted to ride, as shown clearly at Fig. 6.. i

The tumbling lever c has a handle 6 or its equivalent by which the said lever can be manually actuated or actuated by a connection from the loom or dobby to withdraw the catch 6 from the lug c on lever c and thus free lever The freeing of lever allows the link it and bowl 2' to move outwardly to the full extent permitted and the bowl 2' to rest in the curved end as illustrated at Fig. 3, the tension thus being wholly removed from the chain or flexible being actuated at will be the foot or by a connection from the dobby on release of the catch 0 as previously described to project the bowl 1' forwardly to the end it" of the arm 7s and remove tension off the chain on the beam.

Ifdesiredthe tumbling lever may be held in locked position by means of a confined spring t (Fig. 5) instead of by counter weight.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is V 1. In warp tension regulating mechanism, a feeler device for engaging the warp, a pivoted counterbalance lever, a brake operating lever, a vpulley arranged between'the said levers and operatively connected with the said feeler device, and a friction brake for the warp controlled by the said brake operating lever.

2. The cjmbination, with a warp tension reguating mechanism as set forth in claim 1, of a pivoted tumblingv catch normally connecting the feeler with the pulley and, when disengaged, permitting the pulley to be moved independently of the feeler.

3. The combination, with a warp tension regulating mechanism as set forth in claim 1, ofmeans for preventing the return movement of the feeler as the warp is unwound.

at. The combination, with a warp tension regulating mechanism as set forth in claim 1, of antifriction rollers of larger diameter than the pulley mounted concentric with it, the said pulley being arranged to run in contact with the counterbalance lever and the antifriction rollers being arranged to run in contact with the brake operating lever.

In testimony whereof I affix my signature in the presence of two witnesses.

PETER SCHOLES.

Witnesses EWALD S. MosELnY, FR NK L NRIZ. 

